On October 12, 1973, there was a patent about defoliants, herbicides.Category: pyridine-derivatives The title of the patent was Herbicidal N,N’-disubstituted dipyridylium bistribromides. And the patent contained the following:
Herbicidal and defoliant bipyridine derivatives I (n = 2, 3, X = Br3; n = 2, X = ClBr2) and II (R = Me, X = Br3, ClBr2; R = Pr, X = Br3) were prepared Thus 2,2′-bipyridine was treated with Br(CH2)3Br to give 94% I (n = 3, X = Br), which on treatment with Br gave 47% I (n = 3, X = Br3). Wettable powders were prepared using HiSil 233 carrier, Daxad 11 dispersant, and Emcol L72-34 wetting agent. The experimental process involved the reaction of 1,1′-Dipropyl-[4,4′-bipyridine]-1,1′-diium bromide(cas: 52243-87-5).Category: pyridine-derivatives
The Article related to herbicide bipyridylium halide, defoliant bipyridylium halide, Heterocyclic Compounds (More Than One Hetero Atom): Pyrimidines and Quinazolines and other aspects.Category: pyridine-derivatives